/**
 * Product Analytics - Track product interactions
 *
 * Provides functions for tracking product views, impressions,
 * and user interactions with products.
 */

import type { AnalyticsClient } from '@analytics/client';

// ─────────────────────────────────────────────────────────────────────────────
// Types
// ─────────────────────────────────────────────────────────────────────────────

export interface Product {
  id: string;
  name: string;
  price: number;
  currency?: string;
  category?: string;
  brand?: string;
  variant?: string;
  sku?: string;
}

export interface ProductImpression extends Product {
  listName: string;
  position: number;
}

// ─────────────────────────────────────────────────────────────────────────────
// Product Tracking Functions
// ─────────────────────────────────────────────────────────────────────────────

/**
 * Track when a user views a product detail page.
 */
export function trackProductView(client: AnalyticsClient, product: Product): void {
  client.trackEngagement({
    type: 'ecommerce',
    action: 'product_view',
    metadata: {
      productId: product.id,
      productName: product.name,
      price: product.price,
      currency: product.currency || 'USD',
      category: product.category,
      brand: product.brand,
      variant: product.variant,
      sku: product.sku,
    },
  });
}

/**
 * Track product impressions in a list (search results, category page, etc.)
 */
export function trackProductImpressions(
  client: AnalyticsClient,
  impressions: ProductImpression[],
): void {
  // Track as a batch event
  client.trackEngagement({
    type: 'ecommerce',
    action: 'product_impressions',
    metadata: {
      impressionCount: impressions.length,
      listName: impressions[0]?.listName,
      products: impressions.map((p) => ({
        productId: p.id,
        productName: p.name,
        price: p.price,
        position: p.position,
        category: p.category,
      })),
    },
  });
}

/**
 * Track when a user clicks on a product from a list.
 */
export function trackProductClick(
  client: AnalyticsClient,
  product: Product,
  listName: string,
  position: number,
): void {
  client.trackEngagement({
    type: 'ecommerce',
    action: 'product_click',
    metadata: {
      productId: product.id,
      productName: product.name,
      price: product.price,
      listName,
      position,
      category: product.category,
    },
  });
}

/**
 * Track when a user adds a product to their wishlist.
 */
export function trackWishlistAdd(client: AnalyticsClient, product: Product): void {
  client.trackEngagement({
    type: 'ecommerce',
    action: 'wishlist_add',
    metadata: {
      productId: product.id,
      productName: product.name,
      price: product.price,
      category: product.category,
    },
  });
}

/**
 * Track when a user shares a product.
 */
export function trackProductShare(
  client: AnalyticsClient,
  product: Product,
  method: 'email' | 'twitter' | 'facebook' | 'link' | string,
): void {
  client.trackEngagement({
    type: 'ecommerce',
    action: 'product_share',
    metadata: {
      productId: product.id,
      productName: product.name,
      shareMethod: method,
    },
  });
}

/**
 * Track product review submission.
 */
export function trackReviewSubmit(
  client: AnalyticsClient,
  product: Product,
  rating: number,
  hasText: boolean,
): void {
  client.trackEngagement({
    type: 'ecommerce',
    action: 'review_submit',
    metadata: {
      productId: product.id,
      productName: product.name,
      rating,
      hasText,
    },
  });
}

// ─────────────────────────────────────────────────────────────────────────────
// Search Tracking
// ─────────────────────────────────────────────────────────────────────────────

/**
 * Track product search queries.
 */
export function trackSearch(
  client: AnalyticsClient,
  query: string,
  resultCount: number,
  filters?: Record<string, unknown>,
): void {
  client.trackEngagement({
    type: 'ecommerce',
    action: 'search',
    metadata: {
      query,
      resultCount,
      filters,
      hasResults: resultCount > 0,
    },
  });
}

/**
 * Track when user applies filters on a product list.
 */
export function trackFilterApply(
  client: AnalyticsClient,
  filterType: string,
  filterValue: string | string[],
  resultCount: number,
): void {
  client.trackEngagement({
    type: 'ecommerce',
    action: 'filter_apply',
    metadata: {
      filterType,
      filterValue,
      resultCount,
    },
  });
}

/**
 * Track sort order changes.
 */
export function trackSortChange(
  client: AnalyticsClient,
  sortBy: string,
  sortOrder: 'asc' | 'desc',
): void {
  client.trackEngagement({
    type: 'ecommerce',
    action: 'sort_change',
    metadata: {
      sortBy,
      sortOrder,
    },
  });
}